Abstract: A flash light emitting device that irradiates flash light to a work piece, comprises a first flash light discharge lamp and a second flash light discharge lamp. In the flash light emitting device, a time width of a second flash light discharge lamp current is shorter than a time width of a first flash light discharge lamp current, and the second flash light discharge lamp current is inputted into the second flash light discharge lamp after the first flash light discharge lamp current is inputted into the first flash light discharge lamp.

Abstract: A lamp, particularly a discharge lamp, in which an bulb portion of the lamp vessel can be formed with high dimensional accuracy and an advantageous light radiation characteristic and long service life obtained is achieved by the lamp vessel having and its bulb portion and scaling tube portions which are formed from a compacted body of sintered silica glass, and by sealing components, which are hermetically connected to the sealing tube portions and to which an emission part in the bulb is joined, having a first end which is made of silicon dioxide and a second end that is made of a functional gradient material which contains an electrically conductive inorganic material component as the main constituent.